Used to define being annoyed.
add more o's for more power (fooouack).
Ive just hit my thumb with a hammer ( oh fuack!)
someone has annoyed you (god damn it howard, fuack).
by Dave the rave2 May 01, 2006
its generally used in British movies.
- Hey boy, did you see that huge snowball coming over here?
- What!?! Oh, FUACK !!!
by Str187 September 11, 2007

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